Chamberlain Series 1200 User Manual

Invisible Light Beam

Protection Area

Sensor

Sensor

Connect Wire to

Opener Terminals

Bell Wire

Bell Wire

OPENER TERMINAL SCREWS

Sensor

Connections

Wall Control

Connections

(dotted line)

• Center each sensor unit in a "C" wrap with lenses

pointing toward each other across the door (see
Figure 7). 

• Secure sensors with the hardware shown. Finger

tighten the wing nut on the 

receiving eye to allow

for final adjustment. Securely tighten the 

sending

eye wing nut.

• Run the wires from both sensors to the opener.

Use insulated staples to secure the wire to wall
and ceiling.

• Strip 1/4" of insulation from each set of wires.

Separate white and white/black wires sufficiently to
connect to the opener terminal screws: 
white to 2 and white/black to 3.

• Plug in the opener. Make sure the Lock Feature is

off. Green indicator lights in both the sending and
receiving eyes will 

glow steadily if wiring

connections and alignment are correct.

If the indicator light is

off in the receiving eye (and

the invisible light beam path is not obstructed),
alignment is required.

• Loosen the receiving eye wing nut to allow slight

rotation of unit. Adjust sensor vertically and/or
horizontally until the green indicator light 

glows

with a steady light.

• When indicator lights are 

glowing steadily in both

units, tighten the wing nut in the receiving eye unit.

19

1/4-20 x 1-1/2"

Hex Bolt

"C" Wrap

Sensor

with Wire

Wing

Nut

Indicator 

Light

1. If the 

sending eye indicator light does not glow

steadily after installation, check for:

• Electric power to the opener.

• A short in the white or white/black wires. These

can occur under staples or at screw terminal
connections.

• Incorrect wiring between sensors and opener.

• An open wire, (wire break).

• Lock switch on Multi-Function Door Control Panel

is 

on. Turn it off.

2. If the sending eye indicator light 

glows steadily but

the receiving eye indicator light doesn't:

• Check alignment.

• Check for an open wire to the receiving eye.

1/4-20x1-1/2"

Hex Bolt

Wing Nut